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地震波的传播速度可表示为地层中各点坐标的函数,即 V=f(x,y,z)。影响速度的因素是很多的,如岩性、埋深、时代、构造发展史……,因此,速度的横向变化是不可忽视的。显然,用一个统一的速度去解决地质问题已经不能适应勘探发展的要求。变速处理地震剖面已经实现,但在解释上变速成图还是一个难题,其主要困难是如何进行空间归位。无论是用水平叠加剖面成图,还是用叠偏剖面成图,速度的横向变化都是一个难以解决的问题,即使分区成图,内插也相当复杂。因此,必须寻找解决问题的方法。本文就是从 t_0时间上入手,使问题大大简化,即把速度的变化转化为 t_0值的变化,从而实现了变速成图。
Seismic wave propagation velocity can be expressed as a function of the coordinates of each point in the formation, ie V = f (x, y, z). There are many factors that affect the speed, such as lithology, burial depth, age, tectonic history ...... Therefore, the horizontal change of speed can not be ignored. Obviously, with a uniform speed to solve geological problems can no longer meet the requirements of exploration and development. Variable speed seismic profile has been achieved, but the interpretation of the variable speed mapping is still a problem, the main difficulty is how to carry out the spatial homing. Whether it is a horizontal stack profile, or an overlay profile mapping, the horizontal speed change is a difficult problem to solve, even if the partition into the map, the interpolation is quite complicated. Therefore, we must find ways to solve the problem. This article is to start from t_0 time, so that the problem is greatly simplified, that is, the change of speed into t_0 value changes, so as to achieve the variable speed map.